Hey, Joe.
I haven't been under the hood of your Tundra, so I can't say for sure what the problem is. I'd suggest plugging in an OBD reader. If you don't know, an OBD reader plugs into your car* and tells you what the problems are. If there's a check-engine light, there's likely a reason that you'll find on the reader.
*Watch a Youtube video on how to plug it in
I'm not sure if this will help you, and maybe you've already tried it. But I hope it'll help.